Experimental Values from Second Law

Unfortunately, in the continuous on-line experiments with transactinoid elements, the application of the above Second Law and related procedures has not been possible because of the very poor statistics of detected decays. Measurements of this type have been done only with long-lived lighter homologs of the transactinoids in batch tests. Packed columns and low flow rates of the carrier gas were employed to achieve narrow peaks. Major contribution came from Bachmann and co-workers. In Refs. [6,9-11] they measured the adsorption enthalpies and entropies on solid 

Group Compd Adsorbent Group Compd Adsorbent  

Bachmann and co-workers interpreted their data for molecules halides in columns loaded with alkaline halides as evidence for the formation of complexes between the adsorbate and the crystalline halide. Such complexes were considered for application in radiochemical separations earlier by Zvara and co-workers in [3,13,14], who estimated the adsorption enthalpies from the rough adsorption isobar obtained in thermochromatographic experiments using Eq. 5.14. The adsorption enthalpy for NbCls on KC1 [14] is intermediate between the data of Table 5.1 for the adsorbents NaCl and CsCl, so that the results of the two groups are consistent. 

The numerous values obtained in [6,9-11] would deserve more analysis, discussion and comparison with later data. There are some unexpected trends and deviations in the Aads H values possibly, they originate from ambiguous chemical states of the particular elements. The experimental data on Aac S.S are also of fundamental interest. As will be seen later in this chapter, evaluation of the experiments with TAEs is based on calculation of the adsorption entropy from the first principles. The studies [6,9-11] reported observation of a correlation between the experimental 

Steffen and Bachmann [20,21] also measured the adsorption characteristics on quartz for the volatile oxides of Tc, Re, Ru, Os and Ir, as well as for the hydroxides of Tc and Re. The techniques were isothermal chromatography and thermochromatography the prescriptions were outlined in Sect. 5.1.1. Some of their data are also included in Table 5.1. 

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